The Otavi Group is a thick succession of Neoproterozoic carbonates exposed within the Otavi foreland fold belt of northern Namibia (Fig. 1). It overlies predominantly coarse-grained terrigenous siliciclastic and local volcanic rocks of the Nosib Group and is overlain by fine- to coarse-grained Mulden Group siliciclastic sediments (Hedberg, 1979; Guj, 1970). Lithostratigraphic subdivision and nomenclature presently in use for the Otavi Group (Fig. 2) is based on several decades of regional mapping, mainly in the Otavi Mountainland and eastern Kaokoveld (Fig. 1), and is the classification adopted formally by the South African Committee for Stratigraphy (SACS, 1980). A key element of this stratigraphic classification is a glaciogenic diamictite horizon, the Chuos Formation, presumed to represent a single time-stratigraphic marker separating lower Otavi (Abenab Subgroup) from upper Otavi (Tsumeb Subgroup) rocks (Fig. 2). However recent field studies along the Fransfontein Ridge flanking the southern margin of the Kamanjab Inlier and within adjoining areas of the metamorphic Damara Belt (Swakop Group) (Fig. 1) have established the presence of two, stratigraphically and lithologically distinct, glacial diamictite intervals (Hoffmann, 1994; Prave and Hoffmann, 1995). The two diamictites are each capped by unique post-glacial dolostone and occupy distinct stratigraphic positions within the Otavi Group (Prave and Hoffmann, 1995). Here we present new field data to further constrain the stratigraphic position and correlation of the two diamictites and associated cap carbonates within the Otavi fold belt and, based on this evidence, propose a substantially revised subdivision and interbasinal correlation of the Otavi Group carbonate sequence.